#include	<u.h>#include	<libc.h>#include	<bio.h>#include	<bootexec.h>#include	<mach.h> /* *	All a.out header types.  The dummy entry allows canonical *	processing of the union as a sequence of longs */ typedef struct {	union{		Exec;			/* in a.out.h */		struct mipsexec;	/* Hobbit uses this header too */		struct sparcexec;		struct nextexec;		struct i960exec;	} e;	long dummy;		/* padding to ensure extra long */} ExecHdr; static	void	i960boot(Fhdr *, ExecHdr *);static	void	nextboot(Fhdr *, ExecHdr *);static	void	sparcboot(Fhdr *, ExecHdr *);static	void	mipsboot(Fhdr *, ExecHdr *);static	void	hobbitboot(Fhdr *, ExecHdr *);static	void	common(Fhdr *, ExecHdr *);static	void	adotout(Fhdr *, ExecHdr *);static	void	setsym(Fhdr *, long, long, long, long);static	void	setdata(Fhdr *, long, long, long, long);static	void	settext(Fhdr *, long, long, long, long);static	void	hswal(long *, int, long (*) (long)); /* *	definition of per-executable file type structures */ typedef struct Exectable{	long	magic;			/* big-endian magic number of file */	char	*name;			/* executable identifier */	int	type;			/* Internal code */	Mach	*mach;			/* Per-machine data */	ulong	hsize;			/* header size */	long	(*swal)(long);		/* beswal or leswal */	void	(*hparse)(Fhdr *, ExecHdr *);} ExecTable; extern	Mach	mmips;extern	Mach	msparc;extern	Mach	m68020;extern	Mach	mi386;extern	Mach	mi960;extern	Mach	mhobbit; ExecTable exectab[] ={	{ V_MAGIC,			/* Mips v.out */		"mips plan 9 executable",		FMIPS,		&mmips,		sizeof(Exec),		beswal,		adotout },	{ 0x160<<16,			/* Mips boot image */		"mips plan 9 boot image",		FMIPSB,		&mmips,		sizeof(struct mipsexec),		beswal,		mipsboot },	{ 0x161<<16,			/* hobbit boot image */		"hobbit plan 9 boot image",		FHOBBITB,		&mhobbit,		sizeof(struct mipsexec),		beswal,		hobbitboot },	{ K_MAGIC,			/* Sparc k.out */		"sparc plan 9 executable",		FSPARC,		&msparc,		sizeof(Exec),		beswal,		adotout },	{ 0x01030107, 			/* Sparc boot image */		"sparc plan 9 boot image",		FSPARCB,		&msparc,		sizeof(struct sparcexec),		beswal,		sparcboot },	{ A_MAGIC,			/* 68020 2.out & boot image */		"68020 plan 9 executable",		F68020,		&m68020,		sizeof(Exec),		beswal,		common },	{ 0xFEEDFACE,			/* Next boot image */		"next plan 9 boot image",		FNEXTB,		&m68020,		sizeof(struct nextexec),		beswal,		nextboot },	{ I_MAGIC,			/* I386 8.out & boot image */		"386 plan 9 executable",		FI386,		&mi386,		sizeof(Exec),		beswal,		common },	{ J_MAGIC,			/* I960 6.out (big-endian) */		"960 plan 9 executable",		FI960,		&mi960,		sizeof(Exec),		beswal,		adotout },	{ 0x61010200, 			/* I960 boot image (little endian) */		"960 plan 9 boot image",		FI960B,		&mi960,		sizeof(struct i960exec),		leswal,		i960boot },	{ Z_MAGIC,			/* Hobbit z.out */		"hobbit plan 9 executable",		FHOBBIT,		&mhobbit,		sizeof(Exec),		beswal,		adotout },	{ 0 },}; Mach	*mach = &mmips;			/* Global current machine table */ intcrackhdr(int fd, Fhdr *fp){	ExecTable *mp;	ExecHdr d;	int nb, magic; 	fp->type = FNONE;	if ((nb = read(fd, (char *)&d.e, sizeof(d.e))) <= 0)		return 0;	fp->magic = magic = beswal(d.e.magic);		/* big-endian */	for (mp = exectab; mp->magic; mp++) {		if (mp->magic == magic && nb >= mp->hsize) {			hswal((long *) &d, sizeof(d.e)/sizeof(long), mp->swal);			fp->type = mp->type;			fp->name = mp->name;			fp->hdrsz = mp->hsize;			mach = mp->mach;			mp->hparse(fp, &d);			seek(fd, mp->hsize, 0);		/* seek to end of header */			return 1;		}	}	return 0;}/* * Convert header to canonical form */static voidhswal(long *lp, int n, long (*swap) (long)){	while (n--) {		*lp = (*swap) (*lp);		lp++;	}}/* *	Crack a normal a.out-type header */static voidadotout(Fhdr *fp, ExecHdr *hp){	long pgsize = mach->pgsize; 	settext(fp, hp->e.entry, pgsize, hp->e.text+sizeof(Exec), 0);	setdata(fp, _round(pgsize+fp->txtsz, pgsize), hp->e.data, fp->txtsz,							hp->e.bss);	setsym(fp, hp->e.syms, hp->e.spsz, hp->e.pcsz, fp->datoff+fp->datsz);} /* *	68020 2.out and 68020 bootable images *	386I 8.out and 386I bootable images * */static voidcommon(Fhdr *fp, ExecHdr *hp){	long kbase = mach->kbase; 	adotout(fp, hp);	if (fp->entry & kbase) {		/* Boot image */		switch(fp->type) {		case F68020:			fp->type = F68020B;			fp->name = "68020 plan 9 boot image";			break;		case FI386:			fp->type = FI386B;			fp->name = "386 plan 9 boot image";			break;		default:			break;		}		fp->txtaddr |= kbase;		fp->entry |= kbase;		fp->dataddr |= kbase;	}} /* *	mips bootable image. */static voidmipsboot(Fhdr *fp, ExecHdr *hp){	switch(hp->e.amagic) {	default:	case 0407:	/* some kind of mips */		fp->type = FMIPSB;		settext(fp, hp->e.mentry, hp->e.text_start, hp->e.tsize,					sizeof(struct mipsexec)+4);		setdata(fp, hp->e.data_start, hp->e.dsize,				fp->txtoff+hp->e.tsize, hp->e.bsize);		break;	case 0413:	/* some kind of mips */		fp->type = FMIPSB;		settext(fp, hp->e.mentry, hp->e.text_start, hp->e.tsize, 0);		setdata(fp, hp->e.data_start, hp->e.dsize, hp->e.tsize,					hp->e.bsize);		break;	}	setsym(fp, hp->e.nsyms, 0, hp->e.pcsize, hp->e.symptr);}/* *	hobbit bootable image. */static voidhobbitboot(Fhdr *fp, ExecHdr *hp){	settext(fp, hp->e.mentry, hp->e.text_start, hp->e.tsize,				sizeof(struct mipsexec)+4);	setdata(fp, hp->e.data_start, hp->e.dsize,			fp->txtoff+hp->e.tsize, hp->e.bsize);	setsym(fp, hp->e.nsyms, 0, hp->e.pcsize, hp->e.symptr);}/* *	sparc bootable image */static voidsparcboot(Fhdr *fp, ExecHdr *hp){	fp->type = FSPARCB;	settext(fp, hp->e.sentry, hp->e.sentry, hp->e.stext,					sizeof(struct sparcexec));	setdata(fp, hp->e.sentry+hp->e.stext, hp->e.sdata,					fp->txtoff+hp->e.stext, hp->e.sbss);	setsym(fp, hp->e.ssyms, 0, hp->e.sdrsize, fp->datoff+hp->e.sdata);} /* *	next bootable image */static voidnextboot(Fhdr *fp, ExecHdr *hp){	fp->type = FNEXTB;	settext(fp, hp->e.textc.vmaddr, hp->e.textc.vmaddr,					hp->e.texts.size, hp->e.texts.offset);	setdata(fp, hp->e.datac.vmaddr, hp->e.datas.size,				hp->e.datas.offset, hp->e.bsss.size);	setsym(fp, hp->e.symc.nsyms, hp->e.symc.spoff, hp->e.symc.pcoff,					hp->e.symc.symoff);} /* *	I960 bootable image */static voidi960boot(Fhdr *fp, ExecHdr *hp){	/* long n = hp->e.i6comments.fptrlineno-hp->e.i6comments.fptrreloc; */ 	settext(fp, hp->e.i6entry, hp->e.i6texts.virt, hp->e.i6texts.size,					hp->e.i6texts.fptr);	setdata(fp, hp->e.i6datas.virt, hp->e.i6datas.size,				hp->e.i6datas.fptr, hp->e.i6bsssize);	setsym(fp, 0, 0, 0, 0);	/*setsym(fp, n, 0, hp->e.i6comments.size-n, hp->e.i6comments.fptr); */}  static voidsettext(Fhdr *fp, long e, long a, long s, long off){	fp->txtaddr = a;	fp->entry = e;	fp->txtsz = s;	fp->txtoff = off;}static voidsetdata(Fhdr *fp, long a, long s, long off, long bss){	fp->dataddr = a;	fp->datsz = s;	fp->datoff = off;	fp->bsssz = bss;}static voidsetsym(Fhdr *fp, long sy, long sppc, long lnpc, long symoff){	fp->symsz = sy;	fp->symoff = symoff;	fp->sppcsz = sppc;	fp->sppcoff = fp->symoff+fp->symsz;	fp->lnpcsz = lnpc;	fp->lnpcoff = fp->sppcoff+fp->sppcsz;}